dn: cn
changetype: add
objectclass: ine
hghsfgdsdsdsd
mail: surcom
surname: satya2
givenname: surya2
cn: surya2

dn: cn
changetype: add
objectclass: inetOrgPerson
surname: sa
sddsds
givenname: s
cn: sur

import re

pattern = re.compile(r"(w+):(.*)")

with open("uservolvo2.ldif", "r") as f:
    new_lines = []

    for line in f:

        if line.endswith('n'):
            line = line[:-1]

        if line == "":
            new_lines.append(line)
            continue

        l = pattern.search(line)

        if l:
            new_lines.append(line)
        else:
            new_lines[-1] += line

with open("user_modified.ldif", "a") as f:
    f.write("n".join(new_lines))
    f.write("nn")

with open("file_modified.txt", "a") as f:
    for line in new_lines:
        f.write(line+'n')